Following RadioShack’s lead, it appears as though Sam’s Club will be offering discounts on Apple smartphones for the holidays. A purportedly leaked memo states that the discount retailer will be selling Apple’s iPhone 4 (16 GB) for $147 with a 2-year AT&T service contract. This represents the lowest price we’ve seen to date on a new iPhone 4, though only by $3. Sam’s Club will also apparently give Apple’s iPhone 3GS the same $52 discount, with new units costing just $47 during the promotional period. According to the unconfirmed memo, the sale is set to run from now until Christmas Day.